Display device including display unit having indented shape

ABSTRACT

A display device includes: a substrate including a first indented portion indented inward along one side of the substrate; a first pad group and a second pad group that are spaced apart from each other on the substrate along the one side; a display unit located on the substrate and having a shape indented inward between the first pad group and the second pad group; an encapsulation layer encapsulating the display unit; a first wiring film including a third pad group connected to the first pad group; and a second wiring film including a fourth pad group connected to the second pad group. The first wiring film and the second wiring film are bent from a first surface of the substrate to a second surface of the substrate that is opposite to the first surface of the substrate, and the second wiring film is spaced apart from the first wiring film.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of and priority to Korean PatentApplication No. 10-2018-0106748, filed on Sep. 6, 2018, in the KoreanIntellectual Property Office, the disclosure of which is incorporatedherein in its entirety by reference.

BACKGROUND 1. Field

One or more embodiments of the present disclosure relate to a displaydevice, and more particularly, to a display device including a displayunit having an indented shape.

2. Description of the Related Art

There is an increasing demand for large screens in portable displaydevices including a display unit, such as mobile phones, tablet personalcomputers, game consoles, etc.

Meanwhile, to meet various demands of consumers, peripheral componentsor devices such as a camera module, a speaker, and a sensor that expandand support features of a display device need to be provided with orinstalled on display units of portable display devices.

SUMMARY

The present disclosure provides a display device including a displayunit having an indented shape. The display unit has a form factor thatcan easily provide a plurality of components, particularly for a displayunit having a large screen.

One or more embodiments of the present disclosure include a displaydevice on which various components may be installed while simultaneouslyimplementing a large screen. However, it should be understood thatembodiments described herein should be considered in a descriptive senseonly and not for limitation of the present disclosure.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the exemplary embodiments presented herein.

According to one or more embodiments, a display device includes: asubstrate including a first indented portion indented inward along oneside of the substrate; a first pad group and a second pad group that arespaced apart from each other on the substrate along the one side; adisplay unit located on the substrate and having a shape indented inwardbetween the first pad group and the second pad group; an encapsulationlayer encapsulating the display unit; a first wiring film including athird pad group connected to the first pad group, the first wiring filmbeing bent from a first surface of the substrate to a second surface ofthe substrate that is opposite to the first surface of the substrate;and a second wiring film including a fourth pad group connected to thesecond pad group, the second wiring film being bent from the firstsurface of the substrate to the second surface of the substrate andspaced apart from the first wiring film.

The display device may further include: a flexible printed circuit boardconnected to the first wiring film and the second wiring film.

The flexible printed circuit board may include an integrated circuitchip that overlaps the display unit.

The encapsulation layer may include at least one inorganic layer and atleast one organic layer.

The encapsulation layer may include at least one inorganic layer and atleast one organic layer, an outermost layer of the encapsulation layermay be an inorganic layer, and the inorganic layer may cover a lateralsurface of the at least one organic layer.

The encapsulation layer may include at least one inorganic layer and atleast one organic layer, an outermost layer of the encapsulation layermay be an inorganic layer, and the inorganic layer may cover a lateralsurface of the substrate in which the first indented portion isprovided.

A dummy pixel for testing may be arranged outside the display unit alongthe first indented portion.

A first grounding portion grounded to the first wiring film and a secondgrounding portion grounded to the second wiring film may be respectivelyarranged on the first wiring film and the second wiring film.

A transparent substrate may be arranged on the encapsulation layer.

A black matrix may be arranged on the transparent substrate at alocation corresponding to an outside of the display unit.

A first opening may be provided in the black matrix at a locationcorresponding to the first indented portion.

A second opening may be provided in the transparent substrate at alocation corresponding to the first opening.

The display device may further include a polarization film between theencapsulation layer and the transparent substrate.

The display device may further include an adhesive film between thepolarization film and the transparent substrate.

The display device may further include a filling material spaced apartfrom the adhesive film and surrounding a periphery of the display unit,the filling material being located between the substrate and thetransparent substrate.

The display device may further include a cover panel arranged on thesecond surface of the substrate and including a buffer material.

An end of the cover panel may coincide with an end of the substrate atthe first indented portion.

An end of the cover panel may protrude further to an outer side of thedisplay unit than an end of the substrate at the first indented portion.

Each of the first pad group and the second pad group may include aplurality of pad wirings having oblique lines such that the plurality ofpad wiring are symmetric with respect to a center of the first indentedportion.

Each of the third pad group and the fourth pad group may include aplurality of pad wirings having oblique lines such that the plurality ofpad wirings are symmetric with respect to a center of the first indentedportion.

A maximum depth from an edge of a bent region of the first and secondwiring film to the flexible printed circuit board may be equal to orgreater than a maximum depth from the edge of the bent region of thefirst and second wiring film to the first indented portion.

The flexible printed circuit board may include a second indented portionfacing the first indented portion and indented inward between the firstwiring film and the second wiring film.

A distance from one end of the first wiring film to the flexible printedcircuit board may be equal to or greater than a distance from an end ofthe first indented portion of the substrate to an end of the substrate.

According to one or more embodiments, a display device includes: asubstrate including a first indented portion indented inward along oneside of the substrate; a first pad group and a second pad group that arespaced apart from each other on the substrate along the one side; adisplay unit located on the substrate and having a shape indented inwardbetween the first pad group and the second pad group; an encapsulationlayer encapsulating the display unit; a first wiring film including athird pad group connected to the first pad group, the first wiring filmbeing bent from a first surface of the substrate to a second surface ofthe substrate; a second wiring film including a fourth pad groupconnected to the second pad group, the second wiring film being bentfrom the first surface of the substrate to the second surface of thesubstrate that is opposite to the first surface of the substrate; and afirst connection wiring film connecting the first wiring film to thesecond wiring film and located between the third pad group and thefourth pad group.

The display device may further include a second connection wiring filmarranged at a location facing the first connection wiring film, whereinthe first and second wiring films and the first and second connectionwiring films may form a through hole.

BRIEF DESCRIPTION OF THE DRAWINGS

These and/or other aspects will become apparent and more readilyappreciated from the following description of the embodiments, taken inconjunction with the accompanying drawings in which:

FIGS. 1A to 10 are plan views of a process of connecting a substrate toa wiring film in a display device according to an embodiment;

FIG. 2 is a cross-sectional view of a portion of a display device takenalong line A1-A2 of FIG. 10;

FIG. 3 is a cross-sectional view of a portion of a display device takenalong line B1-B2 of FIG. 10;

FIG. 4 is a cross-sectional view of portion IV of FIG. 1A;

FIGS. 5A to 5C are plan views for comparing a display area of a displaydevice according to an embodiment with a display area of comparativedisplay devices;

FIG. 6 is a cross-sectional view of a portion of a display deviceaccording to another embodiment;

FIG. 7 is a cross-sectional view of a portion of a display deviceaccording to another embodiment;

FIG. 8 is a plan view illustrating that wirings of first and second padgroups and third and fourth pad groups include oblique wirings,according to an embodiment;

FIG. 9 is a plan view of a portion of a display device according toanother embodiment;

FIG. 10 is a plan view of a portion of a display device according toanother embodiment;

FIG. 11 is a plan view of a portion of a display device according toanother embodiment;

FIG. 12 is a plan view of a portion of a display device according toanother embodiment;

FIG. 13 is a plan view of a portion of a display device according toanother embodiment;

FIG. 14 is a plan view of a portion of a display device according toanother embodiment;

FIG. 15 is a cross-sectional view of a portion of a display deviceaccording to another embodiment;

FIGS. 16A and 16B are plan views of a portion of a display deviceaccording to another embodiment;

FIG. 17 is a view of various shapes of a first indented portion; and

FIG. 18 is a view of various shapes of a second indented portion.

DETAILED DESCRIPTION

As the present disclosure allows for various changes and numerousembodiments, exemplary embodiments will be illustrated in the drawingsand described in detail in the written description. Effects andcharacteristics of the present disclosure, and one or more methods ofaccomplishing these will be apparent when referring to the exemplaryembodiments described with reference to the drawings. The presentdisclosure may, however, be embodied in many different forms and shouldnot be construed as limited to the exemplary embodiments set forthherein.

Hereinafter, the present disclosure will be described more fully withreference to the accompanying drawings, in which the exemplaryembodiments of the present disclosure are shown. When description ismade with reference to the drawings, like reference numerals in thedrawings denote like or corresponding elements, and repeated descriptionthereof will be omitted.

As used herein, the term “and/or” may include any and all combinationsof one or more of the associated listed items.

Expressions such as “at least one of” when preceding a list of elements,may modify the entire list of elements and may not modify the individualelements of the list.

It will be understood that when a layer, region, or component isreferred to as being “formed (located, arranged, disposed, positioned,etc.) on” another layer, region, or component, it can be directly orindirectly formed (located, arranged, disposed, positioned, etc.) on theother layer, region, or component. That is, for example, one or moreintervening layers, regions, or components may be present therebetween.Sizes of elements in the drawings may be exaggerated for convenience ofexplanation. In other words, since sizes and thicknesses of componentsin the drawings may be arbitrarily illustrated for convenience ofexplanation, the following embodiments are not limited thereto.

FIGS. 1A to 1C are plan views of a process of connecting a substrate 10to a wiring film 80 in a display device 1 according to an embodiment,FIG. 2 is a cross-sectional view of a portion of the display device 1taken along line A1-A2 of FIG. 1C, FIG. 3 is a cross-sectional view of aportion of the display device 1 taken along line B1-B2 of FIG. 1C, andFIG. 4 is a cross-sectional view of portion IV of FIG. 1A.

Referring to FIGS. 1A to 4, the display device 1 according to anembodiment includes the substrate 10 including a first indented portionIP1 that is indented inward along one side of the substrate 10, a firstpad group 11 and a second pad group 12 that are arranged on thesubstrate 10 as being spaced apart from each other along one side of thesubstrate 10, a display unit 20 that has a shape indented inward betweenthe first pad group 11 and the second pad group 12, an encapsulationlayer 30 that encapsulates the display unit 20, a third pad group 81that is connected to the first pad group 11, a first wiring film 80-1, afourth pad group 82 that is connected to the second pad group 12, and asecond wiring film 80-2 that is spaced apart from the first wiring film80-1. The first wiring film 80-1 and the second wiring film 80-2 may becollectively referred to as the wiring film 80. Referring to FIGS. 1Band 1C, the first wiring film 80-1 and the second wiring film 80-2 arebent from one side of the substrate 10 to another side of the substrate10.

The substrate 10 may include various materials such as a glass material,a metal material, or a plastic material. For example, the substrate 10may include a flexible substrate including, but not limited to, apolymer resin such as polyethersulfone (PES), polyacrylate (PAR),polyetherimide (PEI), polyethylene naphthalate (PEN), polyethyleneterephthalate (PET), polyphenylene sulfide (PPS), polyarylate, polyimide(PI), polycarbonate (PC), and cellulose acetate propionate (CAP).

The substrate 10 includes the first indented portion IP1 that isindented inward from one side of the substrate 10 to an inside of thesubstrate 10. The first indented portion IP1 may be formed by cuttingthe substrate 10 using, for example, a cutting process using a laserbeam.

A component 110 that may provide one or more features of the displaydevice 1 may be arranged in the first indented portion IP1 of thesubstrate 10. Examples of the component 110 include, but are not limitedto, a camera module 111, a speaker 112, and a sensor 113. Herein, thecomponent 110 collectively refers to one or more of the camera module111, the speaker 112, and the sensor 113, and any other component thatmay be arranged in the first indented portion IP1 of the substrate 10.Examples of the sensor 113 include, but are not limited to, a proximitysensor, an illumination sensor, an acceleration sensor, and a biosensor.

The first pad group 11 and the second pad group 12 are arranged to bespaced apart from each other on the substrate 10. For example, the firstpad group 11 and the second pad group 12 are arranged on two oppositesides of a region in which the first indented portion IP1 is formed.

Each of the first pad group 11 and the second pad group 12 includes aplurality of wirings that include a conductive material. Each of thefirst pad group 11 and the second pad group 12 may be connected tovarious wirings (not shown), for example, a scan line, a data line, anda power line that are connected to a plurality of pixels (not shown)arranged in the display unit 20 and may transfer signals to the displayunit 20.

The display unit 20 may include the plurality of pixels (not shown) thatmay display an image. Each of the pixels may include a display elementsuch as an organic light-emitting diode, a liquid crystal element, anelectrophoretic element, and a micro inorganic light-emitting diode. Thepresent embodiment provides a display device that includes an organiclight-emitting diode OLED (see FIG. 4) as an example of the displayelement.

In the present embodiment, the display unit 20 includes a display screenthat has an indented shape at least on one side, which is different froma quadrangular display screen in which four sides are substantiallystraight. The first indented portion IP1 has a predetermined shape and adimension (e.g., width and height) measured from an edge of the displayunit 20.

The encapsulation layer 30 is arranged on the display unit 20. Theencapsulation layer 30 is wider than the display unit 20 to cover anedge of the display unit 20 and prevents external impurities frompenetrating into the display unit 20.

After the first pad group 11 and the second pad group 12 of thesubstrate 10 are respectively aligned with the third pad group 81 of thefirst wiring film 80-1 and the fourth pad group 82 of the second wiringfilm 80-2 (see FIG. 1A) and connected to each other (see FIG. 1B), eachof the first and second wiring films 80-1 and 80-2 is bent from one sideof the substrate 10 to another side of the substrate 10 (see FIG. 1C).

Each of the first and second wiring films 80-1 and 80-2 may include aflexible resin such as a polyimide resin and an epoxy-based resin tofacilitate bending. Each of the third pad group 81 and the fourth padgroup 82 respectively of the first wiring film 80-1 and the secondwiring film 80-2 may include a plurality of wirings that includes aconductive material.

A conductive bonding layer (not shown) such as an anisotropic conductivefilm may be arranged between the first pad group 11 of the substrate 10and the third pad group 81 of the first wiring film 80-1 and between thesecond pad group 12 of the substrate 10 and the fourth pad group 82 ofthe second wiring film 80-2, and the substrate 10 is solidly physicallybonded on and electrically connected to the first and second wiringfilms 80-1 and 80-2 by compression.

In the present embodiment, the first wiring film 80-1 and the secondwiring film 80-2 have a length LH0 and are spaced apart from each other.

A fifth pad group 83 is arranged on one side of the first wiring film80-1 that faces the third pad group 81, and a sixth pad group 84 isarranged on one side of the second wiring film 80-2 that faces thefourth pad group 82.

The first wiring film 80-1 and the second wiring film 80-2 may beconnected to a flexible printed circuit board 90 respectively throughthe fifth pad group 83 and the sixth pad group 84.

The first wiring film 80-1 and the second wiring film 80-2 may include amaterial that is more flexible than that of the flexible printed circuitboard 90 and may be formed to be thinner than the flexible printedcircuit board 90 to reduce bending stress.

Since the first wiring film 80-1 and the second wiring film 80-2 arespaced apart from each other with the first indented portion IP1therebetween, when the first wiring film 80-1 and the second wiring film80-2 are connected to the substrate 10 and then bent, the first wiringfilm 80-1 and the second wiring film 80-2 do not interfere with a spacein which the component 110 may be arranged.

Referring to FIGS. 1B and 3, a maximum depth H1 measured from an edge L0to the flexible printed circuit board 90 may be equal to or greater thana maximum depth H21 measured from the edge L0 to an end of a cover panel70. The edge L0 refers to an outer edge of the first wiring film 80-1and the second wiring film 80-2 when they are bent to be connected tothe cover panel 70 formed on the substrate 10 as indicated in FIGS.10,2, and 3.

Referring to FIG. 3, the end of the cover panel 70 may protrude furtherfrom the first indented portion IP1 toward an outer edge of the displaydevice 1 than an end of the substrate 10. The end of the cover panel 70does not need to have the same shape as that of the first indentedportion IP1. Since the end of the cover panel 70 protrudes further tothe outer edge of the display device 1 than the end of the substrate 10,the cover panel 70 stably supports the substrate 10 while the firstwiring film 80-1 is bonded on the substrate 10.

In the present embodiment, the maximum depth H1 measured from the edgeL0 to the flexible printed circuit board 90 may be equal to or greaterthan the maximum depth H21 measured from the edge L0 to the end of thecover panel 70. The component 110 (see FIG. 1C) may be arranged in aspace between the edge L0 and the end of the cover panel 70.

An integrated circuit chip 100 is mounted on the flexible printedcircuit board 90. The integrated circuit chip 100 may be arranged on arear side of the substrate 10 as being spaced apart from the firstindented portion IP1. Therefore, even when the first and second wiringfilms 80-1 and 80-2 are bent, the integrated circuit chip 100 isarranged away from the first indented portion IP1 in a plan view tooverlap the display unit 20 without causing interference with the spacein which the component 110 may be arranged.

The integrated circuit chip 100 may include at least one of a scandriving circuit chip, a data driving circuit chip, and a power drivingcircuit chip.

A plurality of wirings (not shown) may be arranged between theintegrated circuit chip 100 and the third and fourth pad groups 81 and82 to transfer a signal of the integrated circuit chip 100 to thedisplay unit 20 through the first pad group 11 and the second pad group12.

The cover panel 70 that supports the substrate 10 may be arranged on arear side of the substrate 10. The first and second wiring films 80-1and 80-2 are bent to connect the flexible printed circuit board 90 to arear side of the cover panel 70.

The cover panel 70 may include a cushion tape layer (not shown) thatabsorbs an impact of the rear side of the substrate 10 and a black tapelayer (not shown) that prevents light leakage from the rear side of thesubstrate 10.

FIG. 4 is a cross-sectional view of a structure of the substrate 10, thedisplay unit 20, the encapsulation layer 30, and the cover panel 70around the first indented portion IP1.

In an embodiment in which the display unit 20 includes an organiclight-emitting diode OLED, the encapsulation layer 30 includes aplurality of thin layers 31, 33, and 35.

A first thin film transistor TFT1 including a semiconductor layer 312, agate electrode 14, a source electrode 16 a, and a drain electrode 16 bis arranged on the substrate 10.

A buffer layer 311 is arranged between the substrate 10 and thesemiconductor layer 312, and a gate insulating layer 13 is arrangedbetween the semiconductor layer 312 and the gate electrode 14. Aninterlayer insulating layer 15 is arranged between the gate electrode 14and the source and drain electrodes 16 a and 16 b, and a planarizationlayer 17 covers the interlayer insulating layer 15 and the source anddrain electrodes 16 a and 16 b.

Each of the buffer layer 311, the gate insulating layer 13, and theinterlayer insulating layer 15 may include an inorganic material such assilicon oxide, silicon nitride, and/or silicon oxynitride. Theplanarization layer 17 may include an inorganic layer and/or an organiclayer.

A structure of the first thin film transistor TFT1 and a structure and amaterial of the insulating layers (e.g., the gate insulating layer 13and the interlayer insulating layer 15) shown in FIG. 4 are provided asan example to which the present disclosure is applicable. It is notedthat the present disclosure is not limited to the structure of the firstthin film transistor TFT1 and the insulating layers shown in FIG. 4.

The first thin film transistor TFT1 serves as a driving transistor andis connected to a pixel electrode 21 to transfer a driving signal. Endsof the pixel electrode 21 are surrounded by a pixel-defining layer 18that may include an organic insulating layer. The pixel-defining layer18 may prevent an arc from occurring at the ends of the pixel electrode21.

A second thin film transistor TFT2 may be used as a transistor fortesting a performance of a device rather than being used as a drivingtransistor. The second thin film transistor TFT2 may have the samestructure as that of the first thin film transistor TFT1.

An intermediate layer (not shown) including an organic emission layer 22may be arranged on the pixel electrode 21. The organic emission layer 22may include a low molecular organic emission material or a polymerorganic emission material. In a case where the organic emission layer 22includes a low molecular material, the intermediate layer may furtherinclude at least one of a hole injection layer, a hole transport layer,an electron transport layer, and an electron injection layer. In a casewhere the organic emission layer 22 includes a polymer material, theintermediate layer may further include a hole transport layer.

An opposite electrode 23 provided in common on a plurality of pixelsPXL1 and PXL2 may be arranged on the organic emission layer 22.

The organic light-emitting diode OLED including the pixel electrode 21,the organic emission layer 22, and the opposite electrode 23 is aself-luminous display element that emits light while an exciton fallsfrom an excited state to a ground state, the exciton being generatedwhen a hole injected from a hole injection electrode and an electroninjected from an electron injection electrode combine in the organicemission layer 22. Since the organic light-emitting diode OLED may beconfigured in a lightweight slim profile, the display device 1 includingthe organic light-emitting diode OLED may be used for a portable displaydevice.

In FIG. 4, the first pixel PXL1 that is arranged close to an inside ofthe display unit 20 corresponds to a pixel in a display area that emitslight based on the above-described operating principle and displays animage of the display device 1. In contrast, the second pixel PXL2 thatis arranged close to the first indented portion IP1 from an edge of thesubstrate 10 may be a dummy pixel that does not display an image.

The second thin film transistor TFT2 may be connected to the secondpixel PXL2. The dummy pixel may be used for a signal test, an agingtest, etc. and may also be used as a barrier or a buffer for reducing adefect of the display device 1.

Since the second pixel PXL2 may be damaged while the first indentedportion IP1 is cut, the second pixel PXL2 may be utilized as a spaceused for a test or a barrier or a buffer to reduce a potential damageinstead of being used as a pixel that displays an image.

The encapsulation layer 30 that encapsulates the display unit 20 mayinclude a plurality of thin film layers. For example, in the presentembodiment, the encapsulation layer 30 may have a structure in which afirst inorganic layer 31, a first organic layer 33, and a secondinorganic layer 35 are sequentially stacked. The encapsulation layer 30is not limited to the present example including the three layers and mayinclude at least one inorganic layer and at least one organic layer.Various modifications to the encapsulation layer 30 may be made withoutdeviating from the scope of the present disclosure.

The first inorganic layer 31 and the second inorganic layer 35 mayinclude silicon oxide, silicon nitride, and/or silicon oxynitride. Thefirst organic layer 33 may include at least one of polyethyleneterephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC),polyimide, polyethylene sulfonate, polyoxymethylene, polyarylate,polyacrylate, and hexamethyldisiloxane (HMDSO).

The first inorganic layer 31 may be curved depending on a structurethereunder, a surface of the first inorganic layer 31 is not flat. Thefirst organic layer 33 may planarize a top surface of the encapsulationlayer 30 by covering the first inorganic layer 31 that may not be flat.The second inorganic layer 35 covers the first organic layer 33.

As described above, when a crack may occur inside the encapsulationlayer 30, cracks occurred between the first inorganic layer 31 and thefirst organic layer 33 and between the first organic layer 33 and thesecond inorganic layer 35 may not be connected to each other through themulti-layered structure of the encapsulation layer 30. Therefore, themulti-layered structure of the encapsulation layer 30 may prevent orreduce forming of a path through which external moisture or impuritiessuch as oxygen may penetrate into the display unit 20.

Meanwhile, the outermost layer of the encapsulation layer 30, e.g., thesecond inorganic layer 35, may be made of an inorganic material toprevent transmission of external moisture. In the present example, anend of the first organic layer 33 may be covered by the second inorganiclayer 35. FIG. 4 shows an example in which the second inorganic layer 35covers a lateral surface of the substrate 10 along the periphery of thefirst indented portion IP1.

Therefore, according to the present embodiment, one or more pixels thatdisplay an image are not directly exposed to a cut surface of thesubstrate 10 when forming the first indented portion IP1 by arrangingthe dummy pixel PXL2 at a portion of the display unit 20 that neighborsthe first indented portion IP1. In addition, the encapsulation layer 30includes at least one inorganic layer and at least one organic layer, anoutermost layer of the encapsulation layer 30 includes an inorganiclayer and covers an end of the organic layer of the encapsulation layer30. Therefore, the outermost inorganic layer of the encapsulation layer30 covers an end of the organic layer of the encapsulation layer 30 toprevent the organic layer from being directly exposed to the outsideduring a cutting process and hence prevent transmission of moisturethrough the lateral surface of the substrate 10 even after the cuttingprocess.

FIGS. 5A to 5C are plan views of comparing a display area of a displaydevice according to an embodiment with a display area of comparativedisplay devices.

FIG. 5A shows a display device according to a first comparative example.In the display device of FIG. 5A, the component 110 that may provide oneor more features of the display device, such as a camera module 111, aspeaker 112, and a sensor 113 is arranged at an upper end of thesubstrate 10, and the wiring film 80 that mounts the integrated circuitchip 100 thereon is arranged at a lower end of the substrate 10.

An approximate display area of the display device according to thecomparative example is a first area D1 that excludes the upper end andthe lower end of the substrate 10.

Though the first area D1 may correspond to an area of the display unit20 that is provided inwardly more than the substrate 10, the substrate10 is used for convenience of explaining the difference of the displayareas between comparative examples in the following.

FIG. 5B shows a display device according to a second comparativeexample. In the display device of FIG. 5B, the first indented portionIP1 is formed at the upper end of the substrate 10, and the component110 that may provide one or more features of the display device, such asthe camera module 111, the speaker 112, and the sensor 113 is arrangedin a cut space (e.g., the first indented portion IP1) of the substrate10. Similar to the first comparative example of FIG. 5A, the wiring film80 that includes the integrated circuit chip 100 is arranged at thelower end of the substrate 10.

An approximate display area of the display device according to thesecond comparative example of FIG. 5B is a sum of the first area D1 anda second area D2 of the upper end of the substrate 10 that excludes thefirst indented portion IP1. Therefore, the display area of the displaydevice according to the second comparative example of FIG. 5B increasescompared to the display area D1 of the display device according to thefirst comparative example of FIG. 5A.

FIG. 5C shows a display device 1 according to the present embodiment. Inthe display device 1 of FIG. 5C, the first wiring film 80-1 and thesecond wiring film 80-2 that are spaced apart from each other arearranged at the upper end of the substrate 10, and the component 110that may provide one or more features of the display device 1, such asthe camera module 111, the speaker 112, and the sensor 113 is arrangedin a cut space (e.g., the first indented portion IP1) of the substrate10 that is formed by the flexible printed circuit board 90, and thefirst and second wiring films 80-1 and 80-2. In addition, the first andsecond wiring films 80-1 and 80-2 and the flexible printed circuit board90 that includes the integrated circuit chip 100 are arranged at theupper end of the substrate 10.

Therefore, an approximate display area of the display device 1 of FIG.5C is a sum of the first area D1, the second area D2 that excludes thefirst indented portion IP1 at the upper end of the substrate 10, and athird area D3 that extends from the lower end of the substrate 10.Therefore, the display area of the display device 1 according to thepresent embodiment shown in FIG. 5C is increased compared to the displayareas of the comparative examples shown in FIGS. 5A and 5B.

Therefore, the display device 1 of the present embodiment may facilitatemounting of one or more components thereon while enlarging a displayarea of the display device 1 by using a substrate that has an indentedshape.

Referring FIGS. 2 and 3, a polarization film 40 may be arranged on theencapsulation layer 30.

According to one embodiment, the polarization film 40 may include amulti-linear polarization film and a circular polarizer film by bondingthe films having a phase difference.

A transparent substrate 60 may be arranged on the polarization film 40,and an adhesive film 50 may be arranged between the polarization film 40and the transparent substrate 60.

The transparent substrate 60 may include a transparent material. Thetransparent substrate 60 covers not only the display unit 20 but also anarea in which the component 110 is arranged. The transparent substrate60 may include a touchscreen panel that provides a touch-sensing featureon the display unit 20.

According to one embodiment, the polarization film 40 may be formed onthe encapsulation layer 30 after a processing of cutting the firstindented portion IP1. In this case, the polarization film 40 may be cutin advance to reflect the shape of the first indented portion IP1 andthen arranged on the encapsulation layer 30.

According to one embodiment, after the process of cutting the firstindented portion IP1, the adhesive film 50 may be formed on thepolarization film 40. In this case, the adhesive film 50 may be firstcut or coated to reflect the shape of the first indented portion IP1 andthen the adhesive film 50 may be arranged on the polarization film 40.In another embodiment, the adhesive film 50 may be coated first on thetransparent substrate 60, which will be described below, the adhesivefilm 50 may be arranged on the polarization film 40 together with thetransparent substrate 60.

FIG. 6 is a cross-sectional view of a portion of a display device 2according to another embodiment. Differences between the display device1 according to the embodiment of FIG. 3 and the display device 2 aremainly described.

Referring to FIG. 6, an end of the cover panel 70 is substantiallycoincide with an end of the substrate 10 at the first indented portionIP1.

A maximum depth H1 measured from an edge L0 to the flexible printedcircuit board 90 may be substantially equal to or greater than a maximumdepth H22 measured from the edge L0 to the first indented portion IP1that is formed in the substrate 10.

In a case where the end of the cover panel 70 substantially coincideswith the end of the substrate 10 at the first indented portion IP1, aspace that may receive the component 110 may be maximized while thesubstrate 10 is still stably supported.

FIG. 7 is a cross-sectional view of a portion of a display device 3according to another embodiment. Differences between the display device1 according to the embodiment of FIG. 3 and the display device 3 aremainly described.

Referring to FIG. 7, a black matrix BM is arranged on a surface of thetransparent substrate 60 that faces the display unit 20. The blackmatrix BM may be arranged outside the display unit 20, and a moduleopening MO may be formed in a region where the component 110 (see FIG.1C) are arranged. In other words, the module opening MO may be providedin the black matrix BM at a location corresponding to the first indentedportion IP1. A light leakage through the region in which the component110 (see FIG. 1C) is arranged may be prevented by the black matrix BM.

A maximum depth H1 measured from an edge L0 to the flexible printedcircuit board 90 may be substantially equal to or greater than a maximumdepth H23 measured from the edge L0 to a side of the module opening MOof the black matrix BM that is closer to the display unit 20. Thecomponent 110 (see FIG. 1C) may be arranged in a space formed by themodule opening MO.

The cover panel 70 of the display device 3 may be freely designed aslong as it does not overlap the module opening MO of the transparentsubstrate 60.

Meanwhile, though not shown in FIG. 7, a second opening (not shown) maybe formed in a region of the transparent substrate 60 that correspondsto the module opening MO. Unlike the camera module 111 and the sensor113, the speaker 112 may require the second opening (not shown) that isformed in the transparent substrate 60 to transfer sounds.

FIG. 8 is a plan view illustrating that wirings of the first and secondpad groups 11 and 12 and the third and fourth pad groups 81 and 82include oblique wirings according to an embodiment.

When the substrate 10 is aligned with and bonded on the first and secondwiring films 80-1 and 80-2, a conductive bonding layer (not shown) suchas an anisotropic conductive film is arranged between the first padgroup 11 of the substrate 10 and the third pad group 81 of the firstwiring film 80-1 and between the second pad group 12 of the substrate 10and the fourth pad group 82 of the second wiring film 80-2, and thesubstrate 10 is solidly physically bonded on and electrically connectedto the first and second wiring films 80-1 and 80-2 by compression. Inthis case, during the compression, the anisotropic conductive film maynot be aligned in a line and thus disconnection between the anisotropicconductive film and the wirings of the pad group may occur.

The present embodiment may prevent disconnection between the anisotropicconductive film and the pad group by forming the wirings of the firstand second pad groups 11 and 12 and the third and fourth pad groups 81and 82 in oblique line shapes. In one embodiment, the oblique lines havea slope that gradually increases from a first angle (e.g., 0° whenmeasured with respect to a vertical line) to a second angle (e.g., Θ2)outwardly from a center. An angle Θ1 represent an arbitrary anglebetween the first angle and the second angle. A width of oblique linesmay be constant, and a spatial interval between adjacent oblique linesmay be kept constant.

Though FIG. 8 shows the wirings in oblique lines having a slope thatgradually increases from the first angle to the second angle outwardlyfrom a center, the present disclosure is not limited thereto. Forexample, the slope angle of the oblique lines may be constant. Inanother example, the slope angles may gradually decrease from the firstangle to the second angle or gradually increase and decrease, orgradually decrease and increase outwardly from a center. In someembodiments, widths of the oblique lines and spatial intervals betweenadjacent oblique lines may vary.

Each of the first pad group 11 and the second pad group 12 may include aplurality of pad wirings having oblique lines such that the plurality ofpad wirings are symmetric with respect to a center of the first indentedportion IP1.

Each of the third pad group 81 and the fourth pad group 82 may include aplurality of pad wirings having oblique lines such that the plurality ofpad wirings are symmetric with respect to the center of the firstindented portion IP1.

FIG. 9 is a plan view of a portion of a display device 4 according toanother embodiment. When compared to the display device 1 according tothe embodiment of FIG. 1B, differences are mainly described.

A maximum depth H3 measured from an end L3 of the third pad group 81 ofthe first wiring film 80-1 and the fourth pad group 82 of the secondwiring film 80-2 to the flexible printed circuit board 90 may be equalto or greater than a maximum depth H4 measured from an end of thesubstrate 10 to an end of the first indented portion IP1 formed in thesubstrate 10.

FIG. 10 is a plan view of a portion of a display device 5 according toanother embodiment. When compared to the display device 1 according tothe embodiment of FIG. 1B, differences are mainly described.

In the present embodiment, a maximum width W1L measured from a centralaxis C to an inner side of the first wiring film 80-1 may be equal to orgreater than a maximum width W2L measured from the central axis C to aleftmost side of the component 110, and a maximum width W1R measuredfrom the central axis C to an inner side of the second wiring film 80-2may be equal to or greater than a maximum width W2R measured from thecentral axis C to a rightmost side of the component 110.

FIG. 11 is a plan view of a portion of a display device 6 according toanother embodiment. When compared to the display device 1 according tothe embodiment of FIG. 1B, differences are mainly described.

In the present embodiment, a maximum width W3 measured from an end onone side of the first indented portion IP1 formed in the substrate 10 toan edge of the substrate 10 may be equal to or greater than a maximumwidth W4 measured from the end on one side of the first indented portionIP1 to the central axis C. Therefore, an enough space to form the padgroups may be obtained.

FIG. 12 is a plan view of a portion of a display device 7 according toanother embodiment. When compared to the display device 1 according tothe embodiment of FIG. 1B, differences are mainly described.

In the present embodiment, the wiring film 80 further includes a firstconnection wiring film 80-3 that is arranged between the third pad group81 and the fourth pad group 82. The first connection wiring film 80-3may strengthen adhesive force between the substrate 10 and the first andsecond wiring films 80-1 and 80-2 by contacting a portion of thesubstrate 10 between the first pad group 11 and the second pad group 12.

FIG. 13 is a plan view of a portion of a display device 8 according toanother embodiment. When compared to the display device 7 according tothe embodiment of FIG. 12, differences are mainly described.

In the present embodiment, the wiring film 80 further includes a secondconnection wiring film 80-4 that is arranged between the fifth pad group83 and the sixth pad group 84 in addition to the first connection wiringfilm 80-3 that is arranged between the third pad group 81 and the fourthpad group 82. The first and second wiring films 80-1 and 80-2 and thefirst and second connection wiring films 80-3 and 80-4 form a throughhole.

The first and second connection wiring films 80-3 and 80-4 mayrespectively strength adhesive force between the substrate 10 and thefirst and second wiring films 80-1 and 80-2 as well as adhesive forcebetween the first and second wiring films 80-1 and 80-2 and the flexibleprinted circuit board 90.

FIG. 14 is a plan view of a portion of a display device 9 according toanother embodiment. When compared to the display device 1 according tothe embodiment of FIG. 1B, differences are mainly described.

In the present embodiment, the first wiring film 80-1 includes a firstgrounding portion 80-1E, and the second wiring film 80-2 includes asecond grounding portion 80-2E. Each of the first grounding portion80-1E and the second grounding portion 80-2E may include a conductivematerial. The first grounding portion 80-1E and the second groundingportion 80-2E may be respectively grounded on the first wiring film 80-1and the second wiring film 80-2 to prevent generation of staticelectricity of the first wiring film 80-1 and the second wiring film80-2 and suppress or block an electric noise.

FIG. 15 is a cross-sectional view of a portion of a display device 10Eaccording to another embodiment. When compared to the display device 1according to the embodiment of FIG. 2, differences are mainly described.

In the present embodiment, a filling material 120 is further arrangedbetween the substrate 10 and the transparent substrate 60. The fillingmaterial 120 may disperse an impact applied to the substrate 10 and thetransparent substrate 60. Since the filling material 120 surrounds anedge of the encapsulation layer 30 without coming into a direct contactwith the display unit 20 and is also spaced apart from the adhesive film50 by a predetermined interval, a chemical reaction between the fillingmaterial 120 and the adhesive film 50 may be prevented, and the fillingmaterial 120 may be prevented from penetrating into the display unit 20.

FIGS. 16A and 16B are plan views of a portion of a display device 11Eaccording to another embodiment. When compared to the display device 1according to the embodiment of FIG. 1B, differences are mainlydescribed.

In the present embodiment, a second indented portion IP2 is formed inone side of the flexible printed circuit board 90 that faces the firstindented portion IP1, and is indented toward the inside of the flexibleprinted circuit board 90 between the first wiring film 80-1 and thesecond wiring film 80-2. The second indented portion IP2 provides morespace between the flexible printed circuit board 90 and the component110 when lengths of the first wiring film 80-1 and the second wiringfilm 80-2 of the display device 11E are shortened compared to thedisplay device 1 of FIG. 2.

FIG. 17 is a view of various shapes of a first indented portionaccording to an embodiment. FIG. 17 shows a first indented portion IP11having a semicircular shape, a first indented portion IP12 having asemi-elliptical shape, a first indented portion IP13 having an archshape, and a first indented portion IP14 having a quadrangular shape.However, it is noted that the shape of the first indented portion formedin the substrate 10 according to the present disclosure is not limitedto the exemplary shapes shown in FIG. 17.

FIG. 18 is a view of various shapes of a second indented portion formedin the flexible printed circuit board 90. FIG. 18 shows a secondindented portion IP21 having a semicircular shape, a second indentedportion IP22 having a semi-elliptical shape, a second indented portionIP23 having a rectangular shape, and a second indented portion IP24having a quadrangular shape. However, it is noted that the shape of thesecond indented portion formed in the flexible printed circuit board 90according to the present disclosure is not limited to the exemplaryshapes shown in FIG. 18.

Embodiments of the present disclosure provide a display device that mayfacilitate mounting of various components thereon while enlarging a sizeof a display screen by using a substrate that has an indented shape.

Although the present disclosure has been described with reference to theembodiments illustrated in the drawings, they are merely provided asexamples, and it will be understood by those of ordinary skill in theart that various changes in form and details and equivalents thereof maybe made therein without departing from the spirit and scope of thepresent disclosure as defined by the claims.

What is claimed is:
 1. A display device comprising: a substrateincluding a first indented portion indented inward along one side of thesubstrate; a first pad group and a second pad group that are spacedapart from each other on the substrate along the one side; a displayunit located on the substrate and having a shape indented inward betweenthe first pad group and the second pad group; an encapsulation layerencapsulating the display unit; a first wiring film including a thirdpad group connected to the first pad group, the first wiring film beingbent from a first surface of the substrate to a second surface of thesubstrate that is opposite to the first surface of the substrate; and asecond wiring film including a fourth pad group connected to the secondpad group, the second wiring film being bent from the first surface ofthe substrate to the second surface of the substrate and spaced apartfrom the first wiring film.
 2. The display device of claim 1, furthercomprising: a flexible printed circuit board connected to the firstwiring film and the second wiring film.
 3. The display device of claim2, wherein the flexible printed circuit board includes an integratedcircuit chip that overlaps the display unit.
 4. The display device ofclaim 1, wherein the encapsulation layer includes at least one inorganiclayer and at least one organic layer.
 5. The display device of claim 1,wherein the encapsulation layer includes at least one inorganic layerand at least one organic layer, an outermost layer of the encapsulationlayer is an inorganic layer, and the inorganic layer covers a lateralsurface of the at least one organic layer.
 6. The display device ofclaim 1, wherein the encapsulation layer includes at least one inorganiclayer and at least one organic layer, an outermost layer of theencapsulation layer is an inorganic layer, and the inorganic layercovers a lateral surface of the substrate in which the first indentedportion is provided.
 7. The display device of claim 1, wherein a dummypixel for testing is arranged outside the display unit along the firstindented portion.
 8. The display device of claim 1, wherein a firstgrounding portion grounded to the first wiring film and a secondgrounding portion grounded to the second wiring film are respectivelyarranged on the first wiring film and the second wiring film.
 9. Thedisplay device of claim 1, wherein a transparent substrate is arrangedon the encapsulation layer.
 10. The display device of claim 9, wherein ablack matrix is arranged on the transparent substrate at a locationcorresponding to an outside of the display unit.
 11. The display deviceof claim 10, wherein a first opening is provided in the black matrix ata location corresponding to the first indented portion.
 12. The displaydevice of claim 11, wherein a second opening is provided in thetransparent substrate at a location corresponding to the first opening.13. The display device of claim 9, further comprising: a polarizationfilm between the encapsulation layer and the transparent substrate. 14.The display device of claim 13, further comprising: an adhesive filmbetween the polarization film and the transparent substrate.
 15. Thedisplay device of claim 14, further comprising: a filling materialspaced apart from the adhesive film and surrounding a periphery of thedisplay unit, the filling material being located between the substrateand the transparent substrate.
 16. The display device of claim 1,further comprising: a cover panel arranged on the second surface of thesubstrate and including a buffer material.
 17. The display device ofclaim 16, wherein an end of the cover panel coincides with an end of thesubstrate at the first indented portion.
 18. The display device of claim16, wherein an end of the cover panel protrudes further to an outer sideof the display unit than an end of the substrate at the first indentedportion.
 19. The display device of claim 1, wherein each of the firstpad group and the second pad group includes a plurality of pad wiringshaving oblique lines such that the plurality of pad wirings aresymmetric with respect to a center of the first indented portion. 20.The display device of claim 19, wherein each of the third pad group andthe fourth pad group includes a plurality of pad wirings having obliquelines such that the plurality of pad wirings are symmetric with respectto the center of the first indented portion.
 21. The display device ofclaim 2, wherein a maximum depth from an edge of a bent region of thefirst and second wiring film to the flexible printed circuit board isequal to or greater than a maximum depth from the edge of the bentregion of the first and second wiring film to the first indentedportion.
 22. The display device of claim 2, wherein the flexible printedcircuit board includes a second indented portion facing the firstindented portion and indented inward between the first wiring film andthe second wiring film.
 23. The display device of claim 2, wherein adistance from one end of the first wiring film to the flexible printedcircuit board is equal to or greater than a distance from an end of thefirst indented portion of the substrate to an end of the substrate. 24.A display device comprising: a substrate including a first indentedportion indented inward along one side of the substrate; a first padgroup and a second pad group that are spaced apart from each other onthe substrate along the one side; a display unit located on thesubstrate and having a shape indented inward between the first pad groupand the second pad group; an encapsulation layer encapsulating thedisplay unit; a first wiring film including a third pad group connectedto the first pad group, the first wiring film being bent from a firstsurface of the substrate to a second surface of the substrate that isopposite to the first surface of the substrate; a second wiring filmincluding a fourth pad group connected to the second pad group, thesecond wiring film being bent from the first surface of the substrate tothe second surface of the substrate; and a first connection wiring filmconnecting the first wiring film to the second wiring film and locatedbetween the third pad group and the fourth pad group.
 25. The displaydevice of claim 24, further comprising: a second connection wiring filmarranged at a location facing the first connection wiring film, whereinthe first and second wiring films and the first and second connectionwiring films form a through hole.